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They dominated until reptiles appeared, when they mostly gave place to or, as the derivationists will insist, were resolved by divergent variation and natural selection into common fishes, destitute of reptilian characters, and saurian reptiles, the intermediate grades, which, according to a familiar piscine saying, are "neither fish, flesh, nor good red-herring," being eliminated and extinguished by natural consequence of the struggle for existence which Darwin so aptly portrays.
One of the most bitter of these contests was over the question of "revulsion," and "derivation" that is, whether in cases of pleurisy treated by bleeding, the venesection should be made at a point distant from the seat of the disease, as held by the "revulsionists," or at a point nearer and on the same side of the body, as practised by the "derivationists."
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